Dino had the same exact problem when he came to us. In addition to putting him on better food and giving fish oil and regular grooming (which you're already doing) we also rubbed some food-grade coconut oil onto the worst spots. He had a lot of flaking under his arms, for example, and around his rump. If you can identify specific areas of her skin that are the flakiest, it might help alleviate the symptoms a bit applied topically. I just put a dime sized amount in my palm to warm it up and then rub it into the skin of the worst areas. You can get a can of it at most grocery stores. We got the stuff for cooking just in case he licked himself.